[英]What does “alias” mean with respect to the `Sync` trait?
I'm learning Rust, trying to figure out the std::marker::Sync
trait. 我正在学习Rust,试图找出
std::marker::Sync
特征。 The documentation for Sync
starts with the following (version 1.1), emphasis mine: Sync
的文档从以下(版本1.1)开始,强调我的:
Types that can be safely shared between threads when aliased .
别名时可以在线程之间安全共享的类型。
The precise definition is: a type
T
isSync
if&T
is thread-safe.精确的定义是:如果
&T
是线程安全的,则类型T
是Sync
。 In other words, there is no possibility of data races when passing&T
references between threads.换句话说,在线程之间传递
&T
引用时不存在数据争用的可能性。As one would expect, primitive types like
u8
andf64
are allSync
, and so are simple aggregate types containing them (like tuples, structs and enums).正如人们所料,像
u8
和f64
这样的原始类型都是Sync
,包含它们的简单聚合类型(如元组,结构和枚举)也是如此。 …...
This makes zero sense to me, starting with the first sentence. 从第一句话开始,这对我来说毫无意义。 I thought aliasing has to do with statements such as:
我认为别名与以下语句有关:
type Name = String;
What does this have to do with synchronization? 这与同步有什么关系? Perhaps the term “alias” is overloaded here, and I'm missing the second meaning, but I can't find anywhere in the documentation referring to a second kind of aliasing.
也许术语“别名”在这里重载,我错过了第二个含义,但我在文档中的任何地方都找不到第二种别名。
Can someone point me in the right direction? 有人能指出我正确的方向吗?
A value is said to be aliased if there is more than one alias to it. 值是表示,如果有多个别名,以它的别名 。 An alias is just a name.
别名只是一个名字。
In this code: 在这段代码中:
let s1: String = "hello".into();
let s2: &String = &s1;
s1
and s2
are aliases of the same String
value; s1
和s2
是相同String
值的别名; therefore, the String
is aliased. 因此,
String
是别名。
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